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By: Sudershini Moodaly

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# Box and Whisker Plot

Module by: Sudershini Moodaly. E-mail the author

Data Handling

## The Five Number Summary and the Box and Whisker Diagram

The five number summary is made up of the following values:

1.      minimum value: the lowest value in the data

2.      lower quartile (Q1): the median of the first half of the data, the value exactly in the middle

3.      median (Q2): the middle value of the data

4.      upper quartile (Q3): the median of the second half of the data

5.      maximum value: the highest value in the data

## How is a box and whisker diagram drawn?

1. A five number summary must first be established.

Eg. Use the following data to draw a box and whisker diagram.

18 27 34 52 54 59 61 68 78 82 85 87 91 93 100

minimum value = 18

Q1= 52

Q2 (median) = 68

Q3 = 87

maximum value = 100

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